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| Comparison of "Arthropod Island" of Shrub Effect between Two Sandy Grasslands in Northern China |
| Liu Rentao1, Wang Shaokun2, Zhou Juan1 |
1. Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China, Ningxia University, Yinchuan 750021, China;
2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy Sciences, Lanzhou 730000, China |
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Abstract Taking the non-leguminous and leguminous shrubs as the subject and the adjacent open spaces as the control, an investigation on soil arthropods was carried on by hand-sorting method in summer, 2010, in the Horqin Sandy Land and the Mu Us Sandy Land. Based on the relative interaction intensity(RII), the "Arthropod Island" of shrub effect was compared between the two sandy grasslands. The results were shown that(1) the density and richness in Horqin and Mu Us were 76 individual·m-2 and 36, and 125 individual·m-2 and 28, respectively. The dominant groups included adult and larval Tenebrionidae in Horqin, while Carabidae and Formicidae in Mu Us, The number of common groups and rare groups was 12 and 22 in Horqin, and 20 and 6 in Mu Us.(2) The relative interaction intensity(RII) for the total density, richness and Shannon index of soil arthropods were markedly(p<0.05) higher in Mu Us compared with Horqin, regardless of functional traits of shrubs. Also a facilitative effect of shrubs were found on soil arthropods, i.e., RII>0.(3) Only Araneidae, Melolonthidae larvae, and Tenebrionidae larvae indicated the "Arthropod Island" of shrub effect in all the sites set in both desertified regions. The relative interaction intensity(RII) for the density of Araneidae and Tenebrionidae larvae was found to indicate no marked(p>0.05) differences, whereas that for the density of Melolonthidae larvae was found to indicate a marked(p<0.05) differences between the two desertified grasslands. Meanwhile, the non-leguminous and leguminous shrubs were found to indicate a reverse pattern of "Arthropod Island" of shrub effect from one desertified grassland to another.(4) In conclusion, a high level of "Arthropod Island" of shrub effect was found in Mu Us sandy grassland(multiannual rainfall:292 mm) compared with Horqin(397 mm) at the community level, regardless of functional traits of shrubs. At the population level, the difference in "Arthropod Island" of shrub effect on each arthropod taxa depended not only on the inherence of shrubs, but also on the climatic factors in different desertified regions.
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Received: 20 July 2014
Published: 20 November 2015
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2015, Vol. 35 
